Duplicate-printing mechanism for adding-machines



(No Model.)

D. E. FELT. DUPLICATE PRINTING MECHANISM FOR ADDING MACHINES, TYPE WRITERS, &c.

Patented Oct. 5, 1897.

00 EN 00 vv E 00 $352 HIJJQTTORNEYS,

UNITED STATES PAT NT ()FFICE.

DORR E. FELT, OF CHICAGO, ILLINOIS.

DUPLICATE-PRINTING MECHANISM FOR ADDING-MACHINES, TYPE -WRlTERS, &c.

SPECIFICATION forming part of Letters Patent No. 590,972, dated October 5, 1897.

Application filed April 28, 1897.

- bers added and the sums or results; but while the invention has been devised with special reference to calculating-machines it may be used with advantage in any type-writing machine or machine in which type-writing mechanism is used.

By means of the invention I am enabled to print simultaneously an original and a duplicate copy by using a single set of type and a single ink-ribbon and without the employment of any carbon or manifolding paper whatever. This result is obtained by making the duplicate copy upon thin transparent paper and feeding it and the paper for the original upon the opposite sides of the inkribbon, so that both papers are impressed by the same impact of the type or type-hammer, the character being thus printed in reverse upon the back of the duplicate sheet, but showing through it, so as to be distinctly readable upon the front. I operate both papers together by one set of feed-rolls and provide guiding devices which shall separate the sheets as they approach the printing center, so that they will pass upon opposite sides of the ribbon. If a duplicate is not needed or desired, the transparent paper need not be fed to the rolls, so that no waste of paper occurs at such times.

The nature of my invention will be more fully understood from the description which I give below and from the accompanying drawings, in which- Figure 1 is a sectional view of that portion of a calculating-machine to which the invention relates. Fig. 2 is an elevation of the paperguiding devices. Figs. 3 and 4 are sections on the line 3 3 and a 4, respectively,

seem No. 634,186. (No model.)

of Fig. 2. Fig. 5 is a perspective showing the two paper sheets or strips in the act of passing the ribbon. Fig. 6 shows the opposite sides of the printed duplicate sheet.

In said drawings, A represents a segment carrying the type; B, the hammer for impressing the paper and ribbon upon the type; C, C, and C the paper feed-rolls; D,the machineframe supporting the paper-guides, and E the in lr-ribbon YV is the strip or sheet of paper on which the original copy is printed, and Y is the strip or sheet of thin or transparent paper, and both are fed through the rolls shown at the same time when the machine is used, in

producing duplicates. After leaving the rolls, before they reach the ink-ribbon, the papers are separated by suitable guides, so they will pass at opposite sides of the ribbon. My preferred construction, which is illustrated, is best adapted to act upon the paper when the latter is cut angling at its ends, (see Figs. 2 and 5,) the angle upon one strip being reversed from that on the other. This manner of cutting forms a point to upon the advance end and at one side of the strip IV, and a similar point y upon the advance end and at the opposite side of strip Y.

Then the paper issues from rolls 0 and G it comes against guiding-faces upon the frame D, which are adapted to form a slight longitudinal bendor twist in it, the guiding-face of one side being adapted to deflect the pa per from the plane of the guiding-face at the other side. Thus the face F is adapted to force the paper rearwardly,while the face F allows it to move upward in a straight vertical plane. The deflection imparted to one side of the paper by the face F carries that side of the paper to a plane in the rearof the ink-ribbon, and consequently when the paper has been fed to the point indicated at Fig. 2 the point to of the originalsheet IV will stand back of the ribbon, as plainly seen at Fig. 3. At the same time the pointy upon the duplicate sheet not being deflected from a straight vertical plane will move up in front of the ribbon, as seen at Fig. 4. If now a further movement be imparted to the rolls, the two sheets of paper will separate and pass the ribbon at opposite sides of the latter because of the positions to which their advance points have been directed, as above described, such advance points leading the respective sheets in their further movement and insuring their entering the proper paths at dil'feren t sides of t he ribbon; but for greater certainty in the separation of the two sheets or strips of paper I prefer to mount the ribbon-shields H and ll upon a spring-arm G, secured to the frame D at G, the arm G extending across the path of the paper, and the shield H, preferably formed in one piece with it, and operate said arm by hand through the medium of a lever G pivoted upon the frame D at G 13y moving said lever the ribbonshields are carried backward to the position shown at Fig. 4, and thereby the shields are prevented from interfering with the proper movement of the strip Y, and I thereby also move the ribbon back, so that said strip cannot fail to pass in front of it. At the same time by thus moving said shields the point to of the other strip is with greater certainty guided back of the ribbon. As soon as the papers are thus properly started theoperator releases the lever G and it falls back to its normal position under the power of the spring G, carrying the shields an d ribbons also back to their operating positions. From this time of course the two paper strips will move uninterruptedly in their proper paths, and both will be printed at the same operation and from the same ink-ribbon, the impression upon the duplicate strip being a reverse impression,\vhich, however,will be visible upon the other side of the strip by reason of its transparent character. The ribbon-shields I1 and H may also be mounted upon the arm G, and one of them may be integral with said arm, though this is not essential, as these shields are not perceptibly moved by the arm G. I do not in this construction need to waste the duplicate paper when duplicates are not desired, as the feeding of that paper can be avoided by severing it just before it enters the feed-rollers. The use of it may be resumed at any time by again entering itbetween the rolls 0 and C.

J represents a paper-cutting edge supported by the frame D in proper position for severing the paper whenever necessary.

It will be noticed that the shields above mentioned prevent any contact by the ribbon with the paper except at the narrow space in the centerwhere the printing is done, so that all smudging or soiling-of the paperis avoided.

I claim- 1. The combination with printing devices of paper-feed rolls and paper-guides F and F the latter acting to impartalongitudinal bend or twist to the paper, substantially as specified.

2. The combination with impression devices and a single ink-ribbon, of paper-feed rolls for feeding the sheets of paper, guides adapted to impart a slight longitudinal bend or twist to the paper, and means for temptn'arily mow ing the ribbon at one side away from its nor mal position substantially as and for the pur pose set forth.

3. The combination with the ink-ribbon, of pressure feed-rolls acting to deliver two associated strips of paper to the printing devices, and bearing upon the paper throughout its width, and guiding devices located between the ribbon and feed-rolls and acting to separate the strips so they will pass upon opposite sides of the ribbon, substantially as specifled.

at. The combination with the ink-ribbon, of pressure feed-rolls acting to deliver two associated strips of paper to the printing devices, and bearing upon the paper throughout its width, and guiding devices located between the ribbon and the feed-rolls and acting to engage and separate the ends of the strips so they will pass upon opposite sides of the rib bon, substantially as specified.

5. The combination with the inleribbon, of pressure feed-rolls acting to deliver two associated strips of paper to the printing devices, and bearing upon the paper throughout its Width, and guiding devices located between the ribbon and the feed-rolls, said devices be ing movable at willand acting to separate the strips and direct them to opposite sides of the ribbon, substantially as specified.

6. The combination with the in k-ribbon and feed-rolls acting to deliver two associated strips of paper to the printing devices, of

'means for deflecting the ribbon from its normal plane, substantially as specified.

7. The combination with the i nk-ribbon an d feed-rol1s acting to deliver two associated strips to the printing devices, of stationary guides F and 1 imparting a slight twist to the paper, and means for deflecting the ribbon, substantially as specified.

S. The combination with the ink-ribbon and feed-rolls acting to deliver two associated strips to the printing devices, of stationary guides F and F imparting a slight twist to the paper, and a movable device for deilecting the ribbon at will, substantially as specified.

9. The combination with the ink-ribbon and feed-rolls acting to deliver two associated strips to the printing devices, of guiding devices acting to position the ends of the strips as set forth preparatory to separation, substantially as specified.

10. The combination with the ink-ribbon and pressing feed-rolls feeding two closelyassociated strips of paper toward one side of the ribbon, of means for separating the ends of the strips and guiding one of them to the other side of the ribbon, substantially as specified.

11. The combination with the ink-ribbon and pressure feed-rolls feeding the two associated strips of paper having their ends cut and the paperfeed rolls, of movable shields H and H substantially as specified.

14. The combination with the ink-ribbon and paper-feeding devices, of shields interposed between the ribbon and the paper at both sides of the printing center and preventing smudging of the paper, substantially as in angling directions, of means for deflecting one side of the paper to the rear of the ribbon, and means for correspondingly deflecting the ribbon, substantially as specified.

12. The combination with the ink-ribbon and pressure-rolls feeding two closely-associated strips of paper, of means essentially specified. such as described for separating the ends of DORR E. FELT. the strips as they approach the ribbon, sub- Vitnesses:

stantially as specified. 13. The combination with the ink-ribbon EDW. S. EVARTS, H. M. MUNDAY. 

